we need to protect their environment. we have a strict quarantine system to protect the integrity of the environment. forty years on, it's still a class-a nature reserve. it's our job to look after them. ...it's my job to look after it. ♪ >>> outgoing secretary of state hillary clinton and president barack obama sat down to dawk with "60 minutes tonight." he had plenty of nice things to say, but it wasn't so long ago they were like this. >> while i was working on the streets you were certificating on the board of walmart. >> you were representing resco in innercity chicago. >> my how things have changed. tonight on cbs they address the tragedy in benghazi, libya this past november. >> i knew chris stevens, i sent him there originally. it was a great personal loss to lose him and three other brave americans. i also have looked back and try to figure out what we can do so that nobody in so far as possible will be in this position again. we also live in a dangerous world. the people i'm proud to serve and work with in our